Boring and facing tool head



April 23, 1935. c. B. COLE ET AL BORIG AND FACING TOOL HEAD Filed 'sept.2a, 1952' 2 sheets-sheet 2 .i5 m. a` mwwm WHW m .N. w, @9 m, w 2Q m 7 m. 7. z iwF PEAU Patented Apr. 23, 1935 a UNITED STATE-.s PATENT OFFICE I 'charles B. cele, Berwyn, epa otto L. Lewis, Chicago, Ill.V

Application september 2s, 1932, serialize. 635,212 s claims. (ci. ivf-5s) Our present inventionV relates toboring and facing tool heads yin general such as are commonly used on a boring bar, the bar being a part of or separate from the machine driving the bar,

and the tool head integral with or separate from the bar. It particularly relates to that type of tool carrying head in which the; tool is secured in avlaterally movable slide for `obtaii'oing'adjustment. The tool itself may beY a cutting tool, a grinder, a burnisher or anyfother device used to machine a surface.

The object of this invention is to provide suchY a boring and facing head rhaving an exceptionally rigid construction andan accurate adjustment over a wide range of diameters. This object we attain by means of the mechanism illustrated in the accompanying drawings, showing a preferred and an alternate construction, the drawings forming a part of this specification. We realize, however, that a wide variety of changes in detail and combination could be made without departing from the spirit of this invention, and therefore, We do not limit ourselves to the constructions shown.

Referring to the drawings:

Figure 1 is a front View of the assembled head;

Fig. 2 is a side View thereof;

Fig. 3 is a View of the head with the tool holders and gear guard removed, the racks being sectioned on plane A, B, of Fig. 4;

Fig. 4 is a sectional view of the assembled head taken on planes C, D, E: of Fig. 3;

Fig. 5 is a sectional view of the tool holder taken on plane F, G, of Fig. 2;

Fig. 6 is an end view of the adjusting worm;

Fig. 7 is a partly sectioned rear View of they assembled head with the tool holders in extended position, the section being taken on plane H, I of Fig. 4;

Fig. 8 is a front View of an alternate construction of the assembled head;

Fig. 9 is a side view thereof, the tool holder being sectioned on plane J, K of Fig. 8; and

Fig. l0 shows an alternate construction for the tool holder clamping bolts.

Referring now to Figs. 1 tol 7, inclusive, the construction shown comprises a body I bored and keywayed for mounting on a boring bar and retained on the bar by set screw 2. Tool holders 3 and 4, which are similar, may be firmly clamped against the face of body I by T-bolts 5 and studs 6. The nuts on the T-bolts and studs are slightly loosened while the tool holders are being adjusted and tightened before operating. Studs 6 pass through slots in tool holders 3 and 4, the slots permitting lateral adjustment of the tool holders. The Aheads of the T-bolts 5 may be movedlaterally in the T-slots in the body I. Dust is excluded from the slots in the tool holdersby elongated washers 1. Cutting tools 8 are secured in the A5 holders by set screws 9, and backed up by hollow head-set screws I0, the Wrench `ho-ld extending entirely through set screws I0 so that theA Wrench may be inserted from the outside when cutting tool 8 is removed.

Tool holders 3 and 4 are guided in their lateral movement by the racks II, which are riveted to the tool holders byerivets I2. The racks have a sliding t in corresponding keyseats in body I.

Racks Ilfh'ave gear teeth on two edges, the 15 teeth on theV inner edge engaging-the gear i3 and the teethk on the outer edge'engaging adjusting pinions I6. The pinions I4 are integral with the Worm gears lmeshing withjworms I6, the ends of the worms I6 being graduated as shown in 20 Fig. 6. Worm gears I5 are retained in one direction by a shoulder in the body I and in the other direction by plugs I'I secured in the body I by screws I8. 'I'he worms I6 are retained endwise by keys I9 which t a groove in the worm and 25 are secured in the body I by screws 20.

The gear I3 is protected by a dust guard 2I.

The amount of lateral travel of the tool holders is indicated by graduation 22 on the face of the body. 30

The tool holders 4 may be moved laterally in either direction by turning the worms IIB 'cy means of a socket Wrench, the motion being transmitted from the Worms to the tool holders through worm gears I5, pinions I4 and racks EI. 35 The tool holders will be independently adjustable if the gear I3 is removed. If it is desired to adjust both tool holders equallyl and simultaneously, one pinion I4 must be removed unless the helix angle on the worm is great enough toV avoid locking.

Referring to Figs. 8, 9 and 10, the body, racks, gears and pinions are substantially the same as in the construction previously described, except the construction of the tool holder itself is different.

The tool holders 23 are clamped against the face of the body I by hollow head cap screws 24 which pass .through counterbored slots 25 in the 50 tool holders 23, the washers 26 being interposed between the under surface of the cap screw head and the bottom of the slot to avoid wear. Asa substitute for the hollow head cap screws 2li, nuts 21 and studs 28 may be used (as shown in Fig. 55

tools 32, similar to tools 8, supported in the tool holders 23. The construction lshown by Figs. 8, 9 and 10 is particularly desirable for lfacing operations and boring bottoming holes.-

A preferred construction of this boring and fac-v ing head Would include hardened yWear surfaces on all exposed and rubbing parts, thereby improving the appearance, eliminating Wear, increasing accuracy, avoiding trouble from dust and chips and increasing durability.

Further modifications Will be apparent to thos skilled in the art and it is desired, therefore that the invention be limited only by the prior art and the scope of the appended claims.I

Having thus described our invention, what YWe claim and desire to secure by Letters Patent is:

l. A boring and facing head for use with a boring bar comprising a tool holder carrier having an opening therethrough, through which a boring bar may extend, aplurality of tool holders slidably mounted on the face of rsaid carrier on opposite sides of the boring bar, racks secured to said slidable tool holders, respectively, said carrier having guideways in its face for said racks, and means for simultaneously adjusting said holders comprising a gear centrally mounted on said carrier and meshing With -said racks and having an opening through which the boring bar may extend. Y Y

2. A boring and facing head for use with a boring bar comprising a tool holder carrier having an opening therethrough, through which a boring bar may extend, a plurality of tool holders slidably mounted on the face of said carrier on opposite sides of the boring bar, racks secured to said slidable tool holders, respectively, said carrier having guideways in its face for said racks, means for simultaneously adjusting said holders comprising a gear centrally mounted on said carrier and meshing with said racks and having an opening through which the boring bar lmay extend, and means for actuating said gear comprisinga pinion having its axis extending longitudinallyV of the boring bar for driving said rack.

3 A boring and facing head for use With a boring bar comprising a tool holder carrier having an opening therethrough, through which a boring bar may extend, a plurality of tool holders slidably mounted 'on the face of said carrier on opposite sides of the boring bar, racks secured to said slidable tool holders, respectively, said carrier having guideways in its face for said racks, means for simultaneously adjusting said holders comprising a gear centrally mounted on said carrier and meshing with said racks and having an opening through which the boringv bar may extend, means for actuating said gear comprising a pinion having its axis extending longitudinally of the boring bar for driving Vsaid rack, a Worm gear rotatable with said pinion, and a Worm for driving the Worm gear Aextending radially with respectlto the carrier and accessible for operation from the periphery of the carrier.

- CHARLES B. COLE.

O'I'IO L. LEWIS. 

